Re: Sure Grip Test Proceedure ???

[Joseph Bitterman <furyrestored@xxxxxxxxx>]

if you jack both rear wheels off the ground and spin one if the other spins the same way you have a sure grip

--- On Tue, 2/15/11, Gary H. <spigot2039@xxxxxxxxxxx> wrote:

> From: Gary H. <spigot2039@xxxxxxxxxxx>
> Subject: Re: Sure Grip Test Proceedure ???
> To: 1962to1965mopars@xxxxxxxxxx
> Date: Tuesday, February 15, 2011, 11:14 AM
> 
> 
> My understanding is that, given the rear is in operating
> condition, with one rear wheel off the ground and the
> transmission in neutral, if you spin the wheel and the
> driveshaft turns it is an open rear. The spider gears that
> connect the two wheels have various types of mechanisms to
> try to connect the axles in a way to make them spin at the
> same speed, with minimal spider gear activity: thus
> "SureGrip" in Mopar terminology.
> 
> In either type of rear ends, under good traction conditions
> the power is distributed to both rear wheels. When power
> overcomes traction available the wheel with the least
> traction will spin. An open differential will spin the wheel
> with least traction while a SureGrip will compensate and
> distribute the power more evenly so both rear wheels turn --
> or spin -- depending on the traction of the surface
> available.
> 
> Thanks,
> Gary H. 
> 
> 
> 
> -----Original Message----- 
> >
> >
> >Some time ago I remeber reading a method to determine
> if a 8-3/4" was a 
> >SureGrip or not.  The car had to be on stands and
> it required two people to 
> >do it....One held a wheel and the other turned one
> backwards or something 
> >like that.  If anybody can outline this proceedure
> correctly and in detail I 
> >would much appreciate the info.  I don't know if
> it has any bearing in the 
> >results, but the rear under my '64 wagon in question,
> is supposed to be from 
> >a '70 B-Body.  I'm really confused on this at the
> moment: on asphalt, the 
> >dark mark left from the passenger side would indicte an
> open rear....on 
> >concrete, it leaves a very uniform and consistant
> amount of mark in a Pair 
> >of tracks.  During the the wheel alignment, the
> tech said he felt a 
> >vibration in the rear, sort of a chattering resistance
> through part of a 
> >single wheel rotation.  He thinks this indicates a
> bad carrier bearing.  The 
> >leveling beams for the alignment rack were on both rear
> wheels when this 
> >vibration was felt. Could this have been a SG unit just
> indexing normally? I 
> >installed the rear to replace the original '64 piece.
> We checked the center 
> >section of the supposed '70 3.23 to find it was a 2.74,
> (or something close 
> >to that). We then installed another 3.23 and threw it
> under the wagon.  That 
> >was soooo many years ago I don't remeber the details on
> the chunk we did 
> >install.  I really hope somebody here can shed
> some light on this because I 
> >don't know whether to be delighted that I have a
> SureGrip or really worried 
> >that the rear is about shot......help!
> >
> >thanks in advance to any and all who reply,
> >John Hammond
> > 
> 
> 
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> 
>